NETWORK DESIGN (CHAPTER 1)
NETWORK REQUIREMENTS
Simple management
Quick recover
Easy for troubleshooting
Timing of Application Response
GOAL
Scalability
Availability
Security
Manageability
Architecture
Flat Network Design
Hierarchical Network Design
designed to reduce the number of routers and switches on a computer network by connecting the devices to a single switch instead of separate switches.
A hierarchical design is used to group devices into multiple networks
Hierarchical design model has three basic layers :
- Core layer
- Distribution layer
- Access layer
Cisco Enterprise
Used to further divide the three-layer hierarchical design into modular areas
Three areas of focus in modular network design :
- Enterprise campus
2.Server farm
- Enterprise edge
Methodology
STEP 1
Identify network requirement
STEP 2
Characterize existing network
STEP 3
Design the network topology and solution
Cisco Lifecycle Services
A six-phase approach (PPDIOO)
- Prepare phase
- Plan phase
- Design phase
4.Implement phase
- Operate phase
- Optimize phase
Approaches for network design
Top-Down
- adapts the network infrastructure to the needs of the organisation.
- The PPDIOO methodology uses the top-down approach.
Bottom-Up
- A common approach
- network designer selects network devices and technologies based on previous experience rather than prior understanding of the organisation.
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ZECHARIAH VIERI ANAK SARI
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